THE MINING AND QUARRY INDUSTRY I912 83' 



etc., which in restricted areas become very abundant. Of valuable 

 minerals, hematite and pyrite occur in commercial quantity, while 

 galena, sphalerite, fluorite and barite are found in smaller bodies. 

 The following analyses of the limestones are based on samples 

 from the different marble quarries, but may be said to represent 

 the general character of the rock when fairly free of admixture. 

 Nos. 1, 2 and 3 are by R. W. Jones, made on samples collected by 

 the writer in 1912. No. 1 is based on sample from the extra-dark 

 quarry of the St Lawrence Marble Quarries ; no. 2, quarry of 

 Gouverneur Marble Co ; no. 3, Rylestone quarry. No. 4 is an an- 

 alysis of the marble in Northern New York quarry made some 

 years ago but not hitherto published. No. 5 represents the dolomitic 

 marble, formerly worked by the White Crystal Marble Co. ; analysis 

 made at Watertown arsenal. 



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Insol ' 3.55 1.26 1. 01 



Si0 2 1.58 .28 



AI2O3 13 .65 .23 1 



Fe 2 3 08 .29 .63/ 79 I0 



MgO 3-49 20 . 64 



MgCOa 6.40 7.50 6.85 7.33 



CaO...: 51.45 31.45 



CaC0 3 87.06 87.47 88.94 91.88 



H2O 1 . 68 1 . 46 1 . 74 



CO, , 42.56 47.38 



S .05 .02 .04 .03 .06 



The typical Gouverneur marbles as illustrated in the first four 

 analyses show a very uniform composition in respect to the lime 

 and magnesia. On the other hand, the white marble shows a much 

 larger amount of magnesia which reaches the proportions of a 

 dolomite. 



The Gouverneur marble all comes from a small area southwest of 

 that town ; the quarries, with one or two exceptions, lie along a 

 narrow belt which extends for a little over a mile in a northeast 

 and southwest direction. The greater number of openings are on 

 the eastern section. The quarries lie on the outcrop of the marble 

 " vein " or beds which dip northwest at an angle ranging from 15 

 to 30 on the eastern end to 8o° or 90° on the western end. Besides 

 the dip, there is a well-marked pitch that seems to be mainly south- 

 west at an angle of 20 ° or 25 °. The structure resembles that of 

 an overturned pitching fold which has undergone deep erosion. 



In color and texture, the marble shows variety, though the differ- 

 ences are not specially prominent between the several merchantable 

 grades of stone. It is mottled white and grayish blue, or light and 



